A061586 a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with eight times its value.

1, 8, 64, 4832, 32642416, 241648321632848, 1632848326424168482416643264, 84824166432642416483216328486432641632848483224164832, 64326416328484832241648321632848326424168482416643264483224164832848241664326432642416163284832642416

Offset

1,2

Links

John Cerkan, Table of n, a(n) for n = 1..12

Mathematica

NestList[FromDigits[Flatten[IntegerDigits/@(8*IntegerDigits[#])]]&, 1, 10] (* Harvey P. Dale, Sep 22 2012 *)

Prog

(Python)
def A061586_first(n):
    an = "1"
    cnt = 1
    a061586 = []
    while cnt < n:
        a061586.append(int(an))
        newan = ""
        for i in an:
            newan += str(8*int(i))
        an = newan
        cnt += 1
    a061586.append(int(an))
    return a061586 # John Cerkan, May 25 2018

Crossrefs

Cf. A061581-A061587.

Sequence in context: A154710 A069033 A087337 * A132545 A034376 A202783

Adjacent sequences: A061583 A061584 A061585 * A061587 A061588 A061589

Keyword

nonn,base,easy

Author

Amarnath Murthy, May 13 2001

Extensions

More terms from Larry Reeves (larryr(AT)acm.org) and Asher Auel, May 15 2001

Status

approved